From e5ef4156ac2439209704a1fda348fca77cf98eb2 Mon Sep 17 00:00:00 2001
From: Roy Orbitson <Roy-Orbison@users.noreply.github.com>
Date: Thu, 13 Jun 2024 15:10:12 +0930
Subject: [PATCH] Fuzzy search of docs

Allow partial terms and multiple search tokens instead of rigid
'begins-with' substring matching.
---
 include/footer.inc             |   2 +-
 js/ext/FuzzySearch.min.js      |  10 ++
 js/ext/typeahead.jquery.min.js |   8 ++
 js/ext/typeahead.min.js        |   1 -
 js/search.js                   | 203 +++++++++++++++------------------
 styles/theme-base.css          |   2 +
 6 files changed, 110 insertions(+), 116 deletions(-)
 create mode 100644 js/ext/FuzzySearch.min.js
 create mode 100644 js/ext/typeahead.jquery.min.js
 delete mode 100644 js/ext/typeahead.min.js

diff --git a/include/footer.inc b/include/footer.inc
index f4dad0d68e..778a3cb55f 100644
--- a/include/footer.inc
+++ b/include/footer.inc
@@ -99,7 +99,7 @@ if (!empty($_SERVER['BASE_PAGE'])
  <!-- External and third party libraries. -->
  <script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
 <?php
- $jsfiles = ["ext/hogan-3.0.2.min.js", "ext/typeahead.min.js", "ext/mousetrap.min.js", "ext/jquery.scrollTo.min.js", "search.js", "common.js"];
+ $jsfiles = ["ext/hogan-3.0.2.min.js", "ext/typeahead.jquery.min.js", "ext/FuzzySearch.min.js", "ext/mousetrap.min.js", "ext/jquery.scrollTo.min.js", "search.js", "common.js"];
  foreach ($jsfiles as $filename) {
    $path = dirname(__DIR__) . '/js/' . $filename;
    echo '<script src="/cached.php?t=' . @filemtime($path) . '&amp;f=/js/' . $filename . '"></script>' . "\n";
diff --git a/js/ext/FuzzySearch.min.js b/js/ext/FuzzySearch.min.js
new file mode 100644
index 0000000000..ac8d3d6c9d
--- /dev/null
+++ b/js/ext/FuzzySearch.min.js
@@ -0,0 +1,10 @@
+/**
+ * @license FuzzySearch.js
+ * Autocomplete suggestion engine using approximate string matching
+ * https://github.com/jeancroy/FuzzySearch
+ *
+ * Copyright (c) 2015, Jean Christophe Roy
+ * Licensed under The MIT License.
+ * http://opensource.org/licenses/MIT
+ */
+!function(){"use strict";function a(b){return void 0===b&&(b={}),this instanceof a?void a.setOptions(this,b,a.defaultOptions,F,!0,this._optionsHook):new a(b)}function b(a,b){for(var c in a)a.hasOwnProperty(c)&&(this[c]=b.hasOwnProperty(c)&&void 0!==b[c]?b[c]:a[c])}function c(a,b){for(var c in b)b.hasOwnProperty(c)&&(a[c]=b[c])}function d(a,b){for(var c=b.length,d=0,e=-1;++e<c;){var f=b[e],g=f.length;a.substr(d,g)===f&&(d+=g)}return d>0?a.substr(d):a}function e(a){var b=a.length;if(!b)return null;for(var c=g(a[0]),d=0;++d<b;)c+="|"+g(a[d]);return new RegExp("(?:^|\\s)\\s*("+c+"):\\s*","g")}function f(a){var b=a.length;if(!b)return null;var c=g(a);return new RegExp("(?:^|["+c+"])+([^"+c+"])[^"+c+"]*","g")}function g(a){var b=/[\-\[\]\/\{}\(\)\*\+\?\.\\\^\$\|]/g;return a.replace(b,"\\$&")}function h(a,b,c,d,e,f){this.item=a,this.fields=b,this.score=c,this.matchIndex=d,this.subIndex=e,this.sortKey=f}function i(a,b){var c=b.score-a.score;if(0!==c)return c;var d=a.sortKey,e=b.sortKey;return 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\ No newline at end of file
diff --git a/js/ext/typeahead.jquery.min.js b/js/ext/typeahead.jquery.min.js
new file mode 100644
index 0000000000..39023c83ec
--- /dev/null
+++ b/js/ext/typeahead.jquery.min.js
@@ -0,0 +1,8 @@
+/*!
+ * typeahead.js 1.3.3
+ * https://github.com/corejavascript/typeahead.js
+ * Copyright 2013-2024 Twitter, Inc. and other contributors; Licensed MIT
+ */
+
+
+!function(a,b){"function"==typeof define&&define.amd?define(["jquery"],function(a){return b(a)}):"object"==typeof module&&module.exports?module.exports=b(require("jquery")):b(a.jQuery)}(this,function(a){var b=function(){"use strict";return{isMsie:function(){return!!/(msie|trident)/i.test(navigator.userAgent)&&navigator.userAgent.match(/(msie |rv:)(\d+(.\d+)?)/i)[2]},isBlankString:function(a){return!a||/^\s*$/.test(a)},escapeRegExChars:function(a){return a.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g,"\\$&")},isString:function(a){return"string"==typeof a},isNumber:function(a){return"number"==typeof a},isArray:a.isArray,isFunction:a.isFunction,isObject:a.isPlainObject,isUndefined:function(a){return void 0===a},isElement:function(a){return!(!a||1!==a.nodeType)},isJQuery:function(b){return b instanceof a},toStr:function(a){return b.isUndefined(a)||null===a?"":a+""},bind:a.proxy,each:function(b,c){function d(a,b){return c(b,a)}a.each(b,d)},map:a.map,filter:a.grep,every:function(b,c){var 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\ No newline at end of file
diff --git a/js/ext/typeahead.min.js b/js/ext/typeahead.min.js
deleted file mode 100644
index 51c61f0778..0000000000
--- a/js/ext/typeahead.min.js
+++ /dev/null
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r=q.adjacencyList[t];q.adjacencyList[t]=r?r.concat(s):s})},_getLocalSuggestions:function(u){var t=this,s=[],q=[],r,p=[];j.each(u,function(w,v){var x=v.charAt(0);!~j.indexOf(s,x)&&s.push(x)});j.each(s,function(v,w){var x=t.adjacencyList[w];if(!x){return false}q.push(x);if(!r||x.length<r.length){r=x}});if(q.length<s.length){return[]}j.each(r,function(v,z){var x=t.itemHash[z],y,w;y=j.every(q,function(A){return ~j.indexOf(A,z)});w=y&&j.every(u,function(A){return j.some(x.tokens,function(B){return B.indexOf(A)===0})});w&&p.push(x)});return p},initialize:function(){var p;this.local&&this._processLocalData(this.local);this.transport=this.remote?new d(this.remote):null;p=this.prefetch?this._loadPrefetchData(this.prefetch):c.Deferred().resolve();this.local=this.prefetch=this.remote=null;this.initialize=function(){return p};return p},getSuggestions:function(u,q){var t=this,s,p,r=false;if(u.length<this.minLength){return}s=j.tokenizeQuery(u);p=this._getLocalSuggestions(s).slice(0,this.limit);if(p.length<this.limit&&this.transport){r=this.transport.get(u,v)}!r&&q&&q(p);function v(w){p=p.slice(0);j.each(w,function(z,y){var A=t._transformDatum(y),x;x=j.some(p,function(B){return A.value===B.value});!x&&p.push(A);return p.length<t.limit});q&&q(p)}}});return n;function m(s,r,t){var q,p;if(j.isFunction(s)){q=s}else{if(j.isString(s)){p=r.compile(s);q=j.bind(p.render,p)}else{q=function(u){return"<p>"+u[t]+"</p>"}}}return q}}();var b=function(){function n(q){var p=this;j.bindAll(this);this.specialKeyCodeMap={9:"tab",27:"esc",37:"left",39:"right",13:"enter",38:"up",40:"down"};this.$hint=c(q.hint);this.$input=c(q.input).on("blur.tt",this._handleBlur).on("focus.tt",this._handleFocus).on("keydown.tt",this._handleSpecialKeyEvent);if(!j.isMsie()){this.$input.on("input.tt",this._compareQueryToInputValue)}else{this.$input.on("keydown.tt keypress.tt cut.tt paste.tt",function(r){if(p.specialKeyCodeMap[r.which||r.keyCode]){return}j.defer(p._compareQueryToInputValue)})}this.query=this.$input.val();this.$overflowHelper=o(this.$input)}j.mixin(n.prototype,k,{_handleFocus:function(){this.trigger("focused")},_handleBlur:function(){this.trigger("blured")},_handleSpecialKeyEvent:function(p){var q=this.specialKeyCodeMap[p.which||p.keyCode];q&&this.trigger(q+"Keyed",p)},_compareQueryToInputValue:function(){var p=this.getInputValue(),r=m(this.query,p),q=r?this.query.length!==p.length:false;if(q){this.trigger("whitespaceChanged",{value:this.query})}else{if(!r){this.trigger("queryChanged",{value:this.query=p})}}},destroy:function(){this.$hint.off(".tt");this.$input.off(".tt");this.$hint=this.$input=this.$overflowHelper=null},focus:function(){this.$input.focus()},blur:function(){this.$input.blur()},getQuery:function(){return this.query},setQuery:function(p){this.query=p},getInputValue:function(){return this.$input.val()},setInputValue:function(q,p){this.$input.val(q);!p&&this._compareQueryToInputValue()},getHintValue:function(){return this.$hint.val()},setHintValue:function(p){this.$hint.val(p)},getLanguageDirection:function(){return(this.$input.css("direction")||"ltr").toLowerCase()},isOverflow:function(){this.$overflowHelper.text(this.getInputValue());return this.$overflowHelper.width()>this.$input.width()},isCursorAtEnd:function(){var q=this.$input.val().length,r=this.$input[0].selectionStart,p;if(j.isNumber(r)){return r===q}else{if(document.selection){p=document.selection.createRange();p.moveStart("character",-q);return q===p.text.length}}return true}});return n;function o(p){return c("<span></span>").css({position:"absolute",left:"-9999px",visibility:"hidden",whiteSpace:"nowrap",fontFamily:p.css("font-family"),fontSize:p.css("font-size"),fontStyle:p.css("font-style"),fontVariant:p.css("font-variant"),fontWeight:p.css("font-weight"),wordSpacing:p.css("word-spacing"),letterSpacing:p.css("letter-spacing"),textIndent:p.css("text-indent"),textRendering:p.css("text-rendering"),textTransform:p.css("text-transform")}).insertAfter(p)}function m(q,p){q=(q||"").replace(/^\s*/g,"").replace(/\s{2,}/g," ");p=(p||"").replace(/^\s*/g,"").replace(/\s{2,}/g," ");return q===p}}();var f=function(){var o={suggestionsList:'<span class="tt-suggestions"></span>'},n={suggestionsList:{display:"block"},suggestion:{whiteSpace:"nowrap",cursor:"pointer"},suggestionChild:{whiteSpace:"normal"}};function p(q){j.bindAll(this);this.isOpen=false;this.isEmpty=true;this.isMouseOverDropdown=false;this.$menu=c(q.menu).on("mouseenter.tt",this._handleMouseenter).on("mouseleave.tt",this._handleMouseleave).on("click.tt",".tt-suggestion",this._handleSelection).on("mouseover.tt",".tt-suggestion",this._handleMouseover)}j.mixin(p.prototype,k,{_handleMouseenter:function(){this.isMouseOverDropdown=true},_handleMouseleave:function(){this.isMouseOverDropdown=false},_handleMouseover:function(r){var q=c(r.currentTarget);this._getSuggestions().removeClass("tt-is-under-cursor");q.addClass("tt-is-under-cursor")},_handleSelection:function(r){var q=c(r.currentTarget);this.trigger("suggestionSelected",m(q))},_show:function(){this.$menu.css("display","block")},_hide:function(){this.$menu.hide()},_moveCursor:function(s){var u,r,q,t;if(!this.isVisible()){return}u=this._getSuggestions();r=u.filter(".tt-is-under-cursor");r.removeClass("tt-is-under-cursor");q=u.index(r)+s;q=(q+1)%(u.length+1)-1;if(q===-1){this.trigger("cursorRemoved");return}else{if(q<-1){q=u.length-1}}t=u.eq(q).addClass("tt-is-under-cursor");this._ensureVisibility(t);this.trigger("cursorMoved",m(t))},_getSuggestions:function(){return this.$menu.find(".tt-suggestions > .tt-suggestion")},_ensureVisibility:function(t){var u=this.$menu.height()+parseInt(this.$menu.css("paddingTop"),10)+parseInt(this.$menu.css("paddingBottom"),10),r=this.$menu.scrollTop(),q=t.position().top,s=q+t.outerHeight(true);if(q<0){this.$menu.scrollTop(r+q)}else{if(u<s){this.$menu.scrollTop(r+(s-u))}}},destroy:function(){this.$menu.off(".tt");this.$menu=null},isVisible:function(){return this.isOpen&&!this.isEmpty},closeUnlessMouseIsOverDropdown:function(){if(!this.isMouseOverDropdown){this.close()}},close:function(){if(this.isOpen){this.isOpen=false;this.isMouseOverDropdown=false;this._hide();this.$menu.find(".tt-suggestions > .tt-suggestion").removeClass("tt-is-under-cursor");this.trigger("closed")}},open:function(){if(!this.isOpen){this.isOpen=true;!this.isEmpty&&this._show();this.trigger("opened")}},setLanguageDirection:function(q){var r={left:"0",right:"auto"},s={left:"auto",right:" 0"};q==="ltr"?this.$menu.css(r):this.$menu.css(s)},moveCursorUp:function(){this._moveCursor(-1)},moveCursorDown:function(){this._moveCursor(+1)},getSuggestionUnderCursor:function(){var q=this._getSuggestions().filter(".tt-is-under-cursor").first();return q.length>0?m(q):null},getFirstSuggestion:function(){var q=this._getSuggestions().first();return q.length>0?m(q):null},renderSuggestions:function(t,u){var q="tt-dataset-"+t.name,r='<div class="tt-suggestion">%body</div>',x,w,y=this.$menu.find("."+q),s,v,z;if(y.length===0){w=c(o.suggestionsList).css(n.suggestionsList);y=c("<div></div>").addClass(q).append(t.header).append(w).append(t.footer).appendTo(this.$menu)}if(u.length>0){this.isEmpty=false;this.isOpen&&this._show();s=document.createElement("div");v=document.createDocumentFragment();j.each(u,function(B,A){A.dataset=t.name;x=t.template(A.datum);s.innerHTML=r.replace("%body",x);z=c(s.firstChild).css(n.suggestion).data("suggestion",A);z.children().each(function(){c(this).css(n.suggestionChild)});v.appendChild(z[0])});y.show().find(".tt-suggestions").html(v)}else{this.clearSuggestions(t.name)}this.trigger("suggestionsRendered")},clearSuggestions:function(s){var q=s?this.$menu.find(".tt-dataset-"+s):this.$menu.find('[class^="tt-dataset-"]'),r=q.find(".tt-suggestions");q.hide();r.empty();if(this._getSuggestions().length===0){this.isEmpty=true;this._hide()}}});return p;function m(q){return q.data("suggestion")}}();var h=function(){var q={wrapper:'<span class="twitter-typeahead"></span>',hint:'<input class="tt-hint" type="text" autocomplete="off" spellcheck="off" disabled>',dropdown:'<span class="tt-dropdown-menu"></span>'},p={wrapper:{position:"relative",display:"inline-block"},hint:{position:"absolute",top:"0",left:"0",borderColor:"transparent",boxShadow:"none"},query:{position:"relative",verticalAlign:"top",backgroundColor:"transparent"},dropdown:{position:"absolute",top:"100%",left:"0",zIndex:"100",display:"none"}};if(j.isMsie()){j.mixin(p.query,{backgroundImage:"url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)"})}if(j.isMsie()&&j.isMsie()<=7){j.mixin(p.wrapper,{display:"inline",zoom:"1"});j.mixin(p.query,{marginTop:"-1px"})}function n(t){var s,u,r;j.bindAll(this);this.$node=m(t.input);this.datasets=t.datasets;this.dir=null;this.eventBus=t.eventBus;s=this.$node.find(".tt-dropdown-menu");u=this.$node.find(".tt-query");r=this.$node.find(".tt-hint");this.dropdownView=new f({menu:s}).on("suggestionSelected",this._handleSelection).on("cursorMoved",this._clearHint).on("cursorMoved",this._setInputValueToSuggestionUnderCursor).on("cursorRemoved",this._setInputValueToQuery).on("cursorRemoved",this._updateHint).on("suggestionsRendered",this._updateHint).on("opened",this._updateHint).on("closed",this._clearHint).on("opened closed",this._propagateEvent);this.inputView=new b({input:u,hint:r}).on("focused",this._openDropdown).on("blured",this._closeDropdown).on("blured",this._setInputValueToQuery).on("enterKeyed tabKeyed",this._handleSelection).on("queryChanged",this._clearHint).on("queryChanged",this._clearSuggestions).on("queryChanged",this._getSuggestions).on("whitespaceChanged",this._updateHint).on("queryChanged whitespaceChanged",this._openDropdown).on("queryChanged whitespaceChanged",this._setLanguageDirection).on("escKeyed",this._closeDropdown).on("escKeyed",this._setInputValueToQuery).on("tabKeyed upKeyed downKeyed",this._managePreventDefault).on("upKeyed downKeyed",this._moveDropdownCursor).on("upKeyed downKeyed",this._openDropdown).on("tabKeyed leftKeyed rightKeyed",this._autocomplete)}j.mixin(n.prototype,k,{_managePreventDefault:function(u){var t=u.data,v,r,s=false;switch(u.type){case"tabKeyed":v=this.inputView.getHintValue();r=this.inputView.getInputValue();s=v&&v!==r;break;case"upKeyed":case"downKeyed":s=!t.shiftKey&&!t.ctrlKey&&!t.metaKey;break}s&&t.preventDefault()},_setLanguageDirection:function(){var r=this.inputView.getLanguageDirection();if(r!==this.dir){this.dir=r;this.$node.css("direction",r);this.dropdownView.setLanguageDirection(r)}},_updateHint:function(){var u=this.dropdownView.getFirstSuggestion(),t=u?u.value:null,x=this.dropdownView.isVisible(),w=this.inputView.isOverflow(),s,y,z,r,v;if(t&&x&&!w){s=this.inputView.getInputValue();y=s.replace(/\s{2,}/g," ").replace(/^\s+/g,"");z=j.escapeRegExChars(y);r=new RegExp("^(?:"+z+")(.*$)","i");v=r.exec(t);this.inputView.setHintValue(s+(v?v[1]:""))}},_clearHint:function(){this.inputView.setHintValue("")},_clearSuggestions:function(){this.dropdownView.clearSuggestions()},_setInputValueToQuery:function(){this.inputView.setInputValue(this.inputView.getQuery())},_setInputValueToSuggestionUnderCursor:function(s){var r=s.data;this.inputView.setInputValue(r.value,true)},_openDropdown:function(){this.dropdownView.open()},_closeDropdown:function(r){this.dropdownView[r.type==="blured"?"closeUnlessMouseIsOverDropdown":"close"]()},_moveDropdownCursor:function(s){var r=s.data;if(!r.shiftKey&&!r.ctrlKey&&!r.metaKey){this.dropdownView[s.type==="upKeyed"?"moveCursorUp":"moveCursorDown"]()}},_handleSelection:function(t){var s=t.type==="suggestionSelected",r=s?t.data:this.dropdownView.getSuggestionUnderCursor();if(r){this.inputView.setInputValue(r.value);s?this.inputView.focus():t.data.preventDefault();s&&j.isMsie()?j.defer(this.dropdownView.close):this.dropdownView.close();this.eventBus.trigger("selected",r.datum,r.dataset)}},_getSuggestions:function(){var r=this,s=this.inputView.getQuery();if(j.isBlankString(s)){return}j.each(this.datasets,function(t,u){u.getSuggestions(s,function(v){if(s===r.inputView.getQuery()){r.dropdownView.renderSuggestions(u,v)}})})},_autocomplete:function(v){var s,r,u,w,t;if(v.type==="rightKeyed"||v.type==="leftKeyed"){s=this.inputView.isCursorAtEnd();r=this.inputView.getLanguageDirection()==="ltr"?v.type==="leftKeyed":v.type==="rightKeyed";if(!s||r){return}}u=this.inputView.getQuery();w=this.inputView.getHintValue();if(w!==""&&u!==w){t=this.dropdownView.getFirstSuggestion();this.inputView.setInputValue(t.value);this.eventBus.trigger("autocompleted",t.datum,t.dataset)}},_propagateEvent:function(r){this.eventBus.trigger(r.type)},destroy:function(){this.inputView.destroy();this.dropdownView.destroy();o(this.$node);this.$node=null},setQuery:function(r){this.inputView.setQuery(r);this.inputView.setInputValue(r);this._clearHint();this._clearSuggestions();this._getSuggestions()}});return n;function m(r){var t=c(q.wrapper),v=c(q.dropdown),w=c(r),s=c(q.hint);t=t.css(p.wrapper);v=v.css(p.dropdown);s.css(p.hint).css({backgroundAttachment:w.css("background-attachment"),backgroundClip:w.css("background-clip"),backgroundColor:w.css("background-color"),backgroundImage:w.css("background-image"),backgroundOrigin:w.css("background-origin"),backgroundPosition:w.css("background-position"),backgroundRepeat:w.css("background-repeat"),backgroundSize:w.css("background-size")});w.data("ttAttrs",{dir:w.attr("dir"),autocomplete:w.attr("autocomplete"),spellcheck:w.attr("spellcheck"),style:w.attr("style")});w.addClass("tt-query").attr({autocomplete:"off",spellcheck:false}).css(p.query);try{!w.attr("dir")&&w.attr("dir","auto")}catch(u){}return w.wrap(t).parent().prepend(s).append(v)}function o(r){var s=r.find(".tt-query");j.each(s.data("ttAttrs"),function(t,u){j.isUndefined(u)?s.removeAttr(t):s.attr(t,u)});s.detach().removeData("ttAttrs").removeClass("tt-query").insertAfter(r);r.remove()}}();(function(){var n={},o="ttView",m;m={initialize:function(r){var q;r=j.isArray(r)?r:[r];if(r.length===0){c.error("no datasets provided")}q=j.map(r,function(t){var s=n[t.name]?n[t.name]:new a(t);if(t.name){n[t.name]=s}return s});return this.each(p);function p(){var u=c(this),t,s=new e({el:u});t=j.map(q,function(v){return v.initialize()});u.data(o,new h({input:u,eventBus:s=new e({el:u}),datasets:q}));c.when.apply(c,t).always(function(){j.defer(function(){s.trigger("initialized")})})}},destroy:function(){return this.each(p);function p(){var r=c(this),q=r.data(o);if(q){q.destroy();r.removeData(o)}}},setQuery:function(p){return this.each(q);function q(){var r=c(this).data(o);r&&r.setQuery(p)}}};jQuery.fn.typeahead=function(p){if(m[p]){return m[p].apply(this,[].slice.call(arguments,1))}else{return m.initialize.apply(this,arguments)}}})()})(window.jQuery);
diff --git a/js/search.js b/js/search.js
index 37fc0ea16f..4e80d2835c 100644
--- a/js/search.js
+++ b/js/search.js
@@ -19,13 +19,12 @@
     /**
      * Adds an item to the backend.
      *
-     * @param {String} id     The item ID. It would help if this was unique.
-     * @param {String} name   The item name to use as a label.
-     * @param {Array}  tokens An array of tokens that should match this item.
+     * @param {String} id          The item ID. It would help if this was unique.
+     * @param {String} name        The item name to use as a label.
+     * @param {String} description Explanatory text for item.
      */
-    Backend.prototype.addItem = function (id, name, description, tokens) {
+    Backend.prototype.addItem = function (id, name, description) {
         this.elements[id] = {
-            tokens: tokens,
             id: id,
             name: name,
             description: description
@@ -42,52 +41,18 @@
         var array = [];
 
         $.each(this.elements, function (_, element) {
-            array.push(element);
-        });
-
-        /* This is a rather convoluted sorting function, but the idea is to
-         * make the results as useful as possible, since only a few are shown
-         * at any one time. In general, we favour shorter names over longer
-         * ones, and favour regular functions over methods when sorting
-         * functions. Ideally, this would actually sort based on function
-         * popularity, but this is a simpler algorithmic approach for now that
-         * seems to result in generally useful results. */
-        array.sort(function (a, b) {
-            var a = a.name;
-            var b = b.name;
-
-            var aIsMethod = (a.indexOf("::") != -1);
-            var bIsMethod = (b.indexOf("::") != -1);
-
-            // Methods are always after regular functions.
-            if (aIsMethod && !bIsMethod) {
-                return 1;
-            } else if (bIsMethod && !aIsMethod) {
-                return -1;
-            }
-
-            /* If one function name is the exact prefix of the other, we want
-             * to sort the shorter version first (mostly for things like date()
-             * versus date_format()). */
-            if (a.length > b.length) {
-                if (a.indexOf(b) == 0) {
-                    return 1;
-                }
+            element.methodName = element.name.split('::');
+            if (element.methodName.length > 1) {
+                element.methodName = element.methodName.slice(-1)[0];
             } else {
-                if (b.indexOf(a) == 0) {
-                    return -1;
-                }
+                delete element.methodName;
             }
-
-            // Otherwise, sort normally.
-            if (a > b) {
-                return 1;
-            } else if (a < b) {
-                return -1;
-            }
-
-            return 0;
+            array.push(element);
         });
+
+        /**
+         * Old pre-sorting has no effect on results sorted by score.
+         */
         return array;
     };
 
@@ -143,21 +108,8 @@
                  * of data this is, and hence which backend this should go
                  * into. */
                 if (item[0]) {
-                    var tokens = [item[0]];
                     var type = null;
 
-                    if (item[0].indexOf("_") != -1) {
-                        tokens.push(item[0].replace("_", ""));
-                    }
-                    if (item[0].indexOf("::") != -1) {
-                        /* We'll add tokens to make the autocompletion more
-                         * useful: users can search for method names and can
-                         * specify that they only want method names by
-                         * prefixing their search with ::. */
-                        tokens.push(item[0].split("::")[1]);
-                        tokens.push("::" + item[0].split("::")[1]);
-                    }
-
                     switch(item[2]) {
                         case "phpdoc:varentry":
                             type = "variable";
@@ -190,7 +142,7 @@
                     }
 
                     if (type) {
-                        backends[type].addItem(id, item[0], item[1], tokens);
+                        backends[type].addItem(id, item[0], item[1]);
                     }
                 }
             });
@@ -270,33 +222,74 @@
          * @param {Object} backends An array-like object containing backends.
          */
         var enableSearchTypeahead = function (backends) {
-            var template = "<h4>{{ name }}</h4>" +
-                           "<span title='{{ description }}' class='description'>{{ description }}</span>";
+            var header = Hogan.compile(
+                '<h3 class="result-heading"><span class="collapsible"></span>{{ label }}' +
+                '<span class="result-count">{{ count }}</span></h3>' +
+                '<div class="tt-suggestions"></div>'
+            );
+            var template = Hogan.compile(
+                '<div>' +
+                    '<h4>{{ name }}</h4>' +
+                    '<span title="{{ description }}" class="description">{{ description }}</span>' +
+                '</div>'
+            );
 
             // Build the typeahead options array.
             var typeaheadOptions = $.map(backends, function (backend, name) {
-                var local = backend instanceof Backend ? backend.toTypeaheadArray() : backend;
+                var fuzzyhound = new FuzzySearch({
+                    source: backend.toTypeaheadArray(),
+                    token_sep: ' \t.,-_', // treat colon as part of token, ignore tabs (from pasted content)
+                    score_test_fused: true,
+                    keys: [
+                        'name',
+                        'methodName',
+                        'description'
+                    ],
+                    thresh_include: 5.0,
+                    thresh_relative_to_best: 0.7,
+                    bonus_match_start: 0.7,
+                    bonus_token_order: 1.0,
+                    bonus_position_decay: 0.3,
+                    token_query_min_length: 1,
+                    token_field_min_length: 2
+                });
 
                 return {
+                    source: fuzzyhound,
                     name: name,
-                    local: backend.toTypeaheadArray(),
-                    header: '<h3 class="result-heading"><span class="collapsible"></span>' + backend.label + '</h3>',
                     limit: options.limit,
-                    valueKey: "name",
-                    engine: Hogan,
-                    template: template
+                    display: 'name',
+                    templates: {
+                        header: function () {
+                            return header.render({
+                                label: backend.label,
+                                count: fuzzyhound.results.length
+                            });
+                        },
+                        suggestion: function (result) {
+                            return template.render({
+                                name: result.name,
+                                description: result.description
+                            });
+                        }
+                    }
                 };
             });
 
-            /* Construct a global that we can use to track the total number of
-             * results from each backend. */
-            var results = {};
-
             // Set up the typeahead and the various listeners we need.
-            var searchTypeahead = $(element).typeahead(typeaheadOptions);
+            var searchTypeahead = element.typeahead(
+                {
+                    minLength: 1,
+                    classNames: {
+                        menu: 'tt-dropdown-menu',
+                        cursor: 'tt-is-under-cursor'
+                    }
+                },
+                typeaheadOptions
+            );
 
             // Delegate click events to result-heading collapsible icons, and trigger the accordion action
-            $('.tt-dropdown-menu').delegate('.result-heading .collapsible', 'click', function() {
+            $('.tt-dropdown-menu').delegate('.result-heading .collapsible', 'click', function () {
                 var el = $(this), suggestions = el.parent().parent().find('.tt-suggestions');
                 suggestions.stop();
                 if(!el.hasClass('closed')) {
@@ -310,10 +303,20 @@
             });
 
             // If the user has selected an autocomplete item and hits enter, we should take them straight to the page.
-            searchTypeahead.on("typeahead:selected", function (_, item) {
-                window.location = "/manual/" + options.language + "/" + item.id;
+            searchTypeahead.on("typeahead:select", function (_, item) {
+                window.location = "/manual/" + options.language + "/" + item.id + ".php";
             });
 
+            // Get new parent after initialization
+            var elementParent = element.parent();
+
+            searchTypeahead.on('typeahead:render', function (evt, renderedSuggestions, fetchedAsync, datasetIndex) {
+                // Fix the missing wrapper from typeahead v0.9.3 for UI parity
+                var set = elementParent.find('.tt-dataset-' + datasetIndex);
+                set.children('.tt-suggestions').first().append(set.children('.tt-suggestion'));
+            });
+
+            var lastPattern;
             searchTypeahead.on("keyup", (function () {
                 /* typeahead.js doesn't give us a reliable event for the
                  * dropdown entries having been updated, so we'll hook into the
@@ -323,41 +326,26 @@
                  * entered. */
 
                 // Precompile the templates we need for the fake entries.
-                var moreTemplate = Hogan.compile("<a class='more' href='{{ url }}'>&raquo; {{ num }} more result{{ plural }}</a>");
                 var searchTemplate = Hogan.compile("<a class='search' href='{{ url }}'>&raquo; Search php.net for {{ pattern }}</a>");
 
                 /* Now we'll return the actual function that should be invoked
                  * when the user has typed something into the search box after
                  * typeahead.js has done its thing. */
                 return function () {
-                    // Add result totals to each section heading.
-                    $.each(results, function (name, numResults) {
-                        var container = $(".tt-dataset-" + name, $(element).parent()),
-                            resultHeading = container.find('.result-heading'),
-                            resultCount = container.find('.result-count');
-
-                        // Does a result count already exist in this resultHeading?
-                        if(resultCount.length == 0) {
-                            var results = $("<span class='result-count'>").text(numResults);
-                            resultHeading.append(results);
-                        } else {
-                            resultCount.text(numResults);
-                        }
-
-
-                    });
-
                     // Grab what the user entered.
-                    var pattern = $(element).val();
+                    var pattern = element.val();
+                    if (pattern == lastPattern) {
+                        return;
+                    }
+                    lastPattern = pattern;
 
                     /* Add a global search option. Note that, as above, the
                      * link is only displayed if more than 2 characters have
                      * been entered: this is due to our search functionality
                      * requiring at least 3 characters in the pattern. */
-                    $(".tt-dropdown-menu .search", $(element).parent()).remove();
+                    var dropdown = elementParent.children('.tt-dropdown-menu');
+                    dropdown.children('.search').remove();
                     if (pattern.length > 2) {
-                        var dropdown = $(".tt-dropdown-menu", $(element).parent());
-
                         dropdown.append(searchTemplate.render({
                             pattern: pattern,
                             url: "/search.php?pattern=" + encodeURIComponent(pattern)
@@ -370,19 +358,6 @@
                 };
             })());
 
-            /* Override the dataset._getLocalSuggestions() method to grab the
-             * number of results each dataset returns when a search occurs. */
-            $.each($(element).data().ttView.datasets, function (_, dataset) {
-                var originalGetLocal = dataset._getLocalSuggestions;
-
-                dataset._getLocalSuggestions = function () {
-                    var suggestions = originalGetLocal.apply(dataset, arguments);
-
-                    results[dataset.name] = suggestions.length;
-                    return suggestions;
-                };
-            });
-
             /* typeahead.js adds another input element as part of its DOM
              * manipulation, which breaks the auto-submit functionality we
              * previously relied upon for enter keypresses in the input box to
@@ -390,7 +365,7 @@
             $("<input type='submit' style='visibility: hidden; position: fixed'>").insertAfter(element);
 
             // Fix for a styling issue on the created input element.
-            $(".tt-hint", $(element).parent()).addClass("search-query");
+            elementParent.children(".tt-hint").addClass("search-query");
         };
 
         // Look for the user's language, then fall back to English.
diff --git a/styles/theme-base.css b/styles/theme-base.css
index 97c494b6ce..7cbaed7dbe 100644
--- a/styles/theme-base.css
+++ b/styles/theme-base.css
@@ -1038,6 +1038,8 @@ fieldset {
     padding-top: 3px;
     margin-top: -3px;
     min-width: 100%;
+    overflow: auto;
+    max-height: 90vh;
 }
 
 .tt-dropdown-menu .result-heading {